package collection;

import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;

/**
 * 对Point集合进行排序
 */
public class SortPoint {
    public static void main(String[] args) {
        List<Point> list = new ArrayList<>();
        list.add(new Point(5,8));
        list.add(new Point(33,290));
        list.add(new Point(21,52));
        list.add(new Point(45,6));
        list.add(new Point(55,69));
        list.add(new Point(1,2));
        System.out.println("list原始数据:"+list);

        Collections.sort(list, new Comparator<Point>() {
            @Override
            public int compare(Point o1, Point o2) {
                int len1= o1.getX()*o1.getX()+ o1.getY()* o1.getY();
                int len2 =o2.getX()*o2.getX()+o2.getY()*o2.getY();

                //return len2-len1;//降序
                return len1-len2;//升序
            }
        });

        System.out.println("list排序后:"+list);
    }
}
